Guinness lists Yuma as the sunniest city on Earth, and the thermometer reaches 100 degrees or higher on about 117 days in a typical year. Irrigation and two rivers supply the water that desert pests cannot find elsewhere.
Yuma is the seat of Yuma County, with 95,548 residents at the 2020 census, and sits just 256 feet above sea level in the far southwest corner of Arizona. The city grew up at the Yuma Crossing, a natural ford where the Colorado River narrows, close to where the Gila River joins it. Rain averages only 3.36 inches a year, and the record high is 124 degrees, set in 1995.
Farming shapes everything here. The Yuma area grows about 90 percent of the leafy vegetables produced in the United States from November to March, and more than 175 crops in all, which earns it the name Winter Lettuce Capital of the World. Marine Corps Air Station Yuma and Yuma Proving Ground add military families, and 70,000 or more winter visitors arrive each year. Watered yards matter too: extension research shows irrigated landscapes support far more scorpions than open desert, and roaches and crickets thrive wherever they find moisture.